Overflow Vulnerability in seq_buf_putmem_hex() in Kernel
Summary
GSD-2021-1001427: seq_buf: Fix overflow in seq_buf_putmem_hex(). Affects Kernel versions >= 5e3ca0ec76fce92daa4eed0d02de9c79b1fe3920, < 50b51460f59acbd403475510ad423bb5ea7a4c97. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between software and hardware components, and enables the execution of various processes. The seq_buf_putmem_hex() function is a part of the seq_buf module in the Kernel, which is responsible for managing sequential buffers used for storing data. These buffers are commonly used in various subsystems within the Kernel, such as procfs and debugfs. However, a vulnerability has been identified in the seq_buf_putmem_hex() function that can lead to an overflow.
Vulnerability Detail
The seq_buf_putmem_hex() function in the Kernel is vulnerable to an overflow issue. This vulnerability arises due to insufficient bounds checking when copying data into a sequential buffer. An attacker can exploit this vulnerability by providing specially crafted input, causing the function to write beyond the allocated buffer, resulting in a buffer overflow. This can lead to various consequences, including arbitrary code execution, privilege escalation, or denial of service. The vulnerability was introduced in version v2.6.27 of the Kernel and was fixed in version v4.14.240.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable or restrict access to the affected functionality that utilizes the seq_buf module. This can be achieved by modifying the system configuration or access control settings to prevent potential exploitation of the vulnerability. However, it is strongly advised to apply the official fix by updating the Kernel to the recommended version as soon as possible.
Conclusion
The seq_buf_putmem_hex() function in the Kernel is vulnerable to an overflow issue, which can be exploited by an attacker to execute arbitrary code, escalate privileges, or cause denial of service. It is crucial to update the Kernel to version v4.14.240 or later to mitigate this vulnerability. As a temporary workaround, users can restrict access to the affected functionality, but applying the official fix is highly recommended. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The seq_buf module in the Kernel is responsible for managing sequential buffers used for storing data. These buffers are commonly utilized in various subsystems within the Kernel, such as procfs and debugfs, to provide an interface for accessing and retrieving information.
An attacker can exploit this vulnerability by providing specially crafted input to the seq_buf_putmem_hex() function, causing it to write beyond the allocated buffer. This can lead to a buffer overflow, which may result in arbitrary code execution, privilege escalation, or denial of service.
The potential consequences of this vulnerability include arbitrary code execution, privilege escalation, or denial of service. An attacker who successfully exploits this vulnerability may gain unauthorized access, execute malicious code, or disrupt the normal operation of the system.
This vulnerability was introduced in version v2.6.27 of the Kernel. All subsequent versions up to v4.14.240 are affected. It is recommended to update the Kernel to version v4.14.240 or later to mitigate the vulnerability.
Users can obtain the updated Kernel version, including the fix for this vulnerability, from the official Linux Kernel repository. It is important to regularly update the Kernel to ensure the latest security patches are applied.
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